HP 8112A Operating, Programming And Servicing Manual page 259

1 . Set the HP 81 12A as follows:
Offset Control
2. Check the offset DAC's output-voltage against the following table.
Table 1 0.5-8. Amplitude Gain Control truth table
HP 8112A
Setting
HIL +8.0 V
to
HIL +2.0 V
HIL + l .99 V
to
HIL -7.9 V
HILC Mode
Area
RCL
Output
If
necessary you can also check that the DAC is receiving the
correct data from the offset latches.
Table 1 0.5-9. Offset DAC - Output Voltages
+8.00 v
+5.62 v
+ l .05 v
+0.55 v
+0.15 v
+0.10 v
+0.05 v
0.00 v
-0.05 v
-0.45 v
-0.95 v
-4.62 v
-7.90 v
U18 Pin
15 16
GR O GR l
L
L
:
H L
L
H
U25/10 U25/9
0
Enabled
HP 8112 Setting Voltage
at TP6
HIL LOL
+7.90 v -7.45 v
+4.62 v -4.80 v
+0.95 v -0.94 v
+0.45 v -0.47 v
+0.05 v -0.09 v
0.00 v -0.05 v
<
-0.05 v 10 mV
-0.10 v +0.05 v
-0.15 v +0.09 v
-0.55 v +0.47 v
- 1 .05 v +0.95 v
-5.62 v +4.80 v
-8.00 v +7.45 v
Servicing the Control Board 10.5-15
Amplitude
Range
1
2
3